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Biaxial deformation and experimental study of PET at conditions applicable to stretch blow molding
Author(s) -
Menary G.H.,
Tan C.W.,
HarkinJones E.M.A.,
Armstrong C.G.,
Martin P.J.
Publication year - 2012
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.22134
Subject(s) - materials science , polyethylene terephthalate , deformation (meteorology) , composite material , molding (decorative) , blow molding , strain rate , thermal , mold , thermodynamics , physics
This article is concerned with understanding the behavior of polyethylene terephthalate (PET) in the injection stretch blow molding (ISBM) process where it is typically biaxially stretched to form bottles for the packaging industry. A comprehensive experimental study was undertaken, analyzing the behavior of three different grades of PET under constant width (CW), simultaneous (EB), and sequential (SQ) equal biaxial deformation. Experiments were carried out at temperature and strain rate ranges of 80–110°C and 1 s −1 to 32 s −1 , respectively, to different stretch ratios. Results show that the biaxial deformation behavior of PET exhibits a strong dependency on forming temperature, strain rate, stretch ratio, deformation mode, and molecular weight. The tests were also monitored via a high speed thermal image camera which showed an increase in temperature between 5°C and 15°C depending on the stretch conditions. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers